How to get a context in a recycler view adapter

Question

You have a few options here:

1. Pass Context as an argument to FeedAdapter and keep it as class field
2. Use dependency injection to inject Context when you need it. I strongly suggest reading about it. There is a great tool for that -- Dagger by Square

3. Get it from any View object. In your case this might work for you:

   holder.pub_image.getContext()

   As pub_image is a ImageView.

Edit As solidak said in the comments section, the original answer could lead to memory leak issues, and it's a bad practice to use this method, so it's better to use another method to access the context.

Original answer:

You can add a global variable:

private Context context;

then assign the context from here:

@Override
public FeedAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,int viewType) {
    // create a new view
    View v=LayoutInflater.from(parent.getContext()).inflate(R.layout.feedholder, parent, false);
    // set the view's size, margins, paddings and layout parameters
    ViewHolder vh = new ViewHolder(v);
    // set the Context here 
    context = parent.getContext();
    return vh;
}

Happy Codding :)

Short answer:

Context context;

@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
    super.onAttachedToRecyclerView(recyclerView);
    context = recyclerView.getContext();
}

Explanation why other answers are not great:

1. Passing Context to the adapter is completely unnecessary, since RecyclerView you can access it from inside the class
2. Obtaining Context at ViewHolder level means that you do it every time you bind or create a ViewHolder. You duplicate operations.
3. I don't think you need to worry about any memory leak. If your adapter lingers outside your Activity lifespan (which would be weird) then you already have a leak.

You can use pub_image context (holder.pub_image.getContext()) :

@Override
public void onBindViewHolder(ViewHolder ViewHolder, int position) {

    holder.txtHeader.setText(mDataset.get(position).getPost_text());

    Picasso.with(holder.pub_image.getContext()).load("http://i.imgur.com/DvpvklR.png").into(holder.pub_image);


}